[AP7] Magnet science and technology 1

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)

[AP7-02] 3D Finite Element Models for Drum-Type HTS Dynamos

*Mujtaba Hussain¹, James G. Storey¹, Dominic A. Moseley¹, Rodney A. Badcock¹ (1. Paihau Robinson Research Institute, Victoria University of Wellington (New Zealand))

Keywords:

Flux pump,HTS dynamo,Drum-type

High-temperature superconducting (HTS) dynamo flux pumps are devices that can inject DC current into HTS circuit without the need for direct electrical connections. Flux pumps reduce heat load by 75% compared to copper leads. The DC output of HTS dynamo depends on stator width and other factors. In drum dynamos, the HTS stator extends circumferentially around the entire rotor. This ensures magnetic flux penetrates the stator continuously at all rotor angles. An experimental drum was built using this configuration. The complex three-dimensional (3D) electromagnetic behaviors of drum dynamos cannot be captured accurately by simplified two-dimensional (2D) models. We developed two 3D finite element models for drum-type HTS dynamos using H–phi and T-A formulations to accurately capture their electromagnetic behavior. Unlike 2D models, these 3D models enable detailed analysis of the complete distribution of screening currents on the HTS tape surface, non-uniform electric field and current distribution across the stator width, and complex geometries of both the HTS tape and permanent magnet. Both models were validated against experimental data, demonstrating superior accuracy over 2D models in predicting DC voltage output. The models revealed that stator width and permanent magnet geometry significantly affect dynamo performance.We used the H-phi model to simulate transport current in the dynamo and compare drum dynamos with squirrel cage designs. We also modelled a type of drum dynamo, called L-zero dynamo, with two stators and two counter rotating rotors for space application. These 3D models provide accurate tools for optimizing HTS dynamo design and performance.